I have a 01 Yamaha yz80 it went 55 to 60 without performance parts and. I got it to go 70mph with performance parts!!! Fast enough to scare you.
I have a yz 80 2001 small wheel and does about 75 mph
About 80-90 mph
75 mph
Probably about 50-60
IT"S 2STROKE and it needs mixed gas 32:1
Faster than you are in bed.
a stock 85 on the street can easily hit 80 in 6th gear...
1982 yz 125K
About 55-60 the most
i have a 1998 yz 80 big wheel. it has pro excell rims on it with tallon hubs. these are heavy, and i weigh 7 and a half stone and i can get bout 70 off mine as it is super tuned for my racing .
If they are both the same engine size, stock, and running right the New 2stroke YZ will dominate a 1980.
about125mph